gistfile1.txt

    // events simply proxy through.
    _onModelEvent : function(ev, model) {
      if (ev === 'change:id') {
        delete this._byId[model.previous('id')];
        this._byId[model.id] = model;
      }
      this.trigger.apply(this, arguments);
    }

  });
    console.log("begin");
       var tmp = Backbone.Collection;
       console.log(tmp._reset());
       console.log("end");

  // Underscore methods that we want to implement on the Collection.
  var methods = ['forEach', 'each', 'map', 'reduce', 'reduceRight', 'find', 'detect',
    'filter', 'select', 'reject', 'every', 'all', 'some', 'any', 'include',
    'invoke', 'max', 'min', 'sortBy', 'sortedIndex', 'toArray', 'size',
    'first', 'rest', 'last', 'without', 'indexOf', 'lastIndexOf', 'isEmpty'];

  // Mix in each Underscore method as a proxy to `Collection#models`.
  _.each(methods, function(method) {
    Backbone.Collection.prototype[method] = function() {
      return _[method].apply(_, [this.models].concat(_.toArray(arguments)));
    };
  });